[IA64] xencomm support for HVMOP_set_mem_type.

remove the runtime warning when HVMOP_set_mem_type is used.
> xencomm_privcmd_hvm_op: unknown HVMOP 8
add xencomm support of HVMOP_set_mem_type.

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>

diff -r d4f9127479a7 arch/ia64/xen/xcom_privcmd.c
--- a/arch/ia64/xen/xcom_privcmd.c	Wed Aug 13 22:50:27 2008 +0900
+++ b/arch/ia64/xen/xcom_privcmd.c	Thu Aug 14 11:03:53 2008 +0900
@@ -722,6 +722,9 @@
 	case HVMOP_set_pci_link_route:
 		argsize = sizeof(xen_hvm_set_pci_link_route_t);
 		break;
+	case HVMOP_set_mem_type:
+		argsize = sizeof(xen_hvm_set_mem_type_t);
+		break;
 
 	case HVMOP_track_dirty_vram:
 		return xencomm_privcmd_hvm_op_track_dirty_vram(hypercall);